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LAMONT GEOLOGICAL OBSERVATORY
PALISADES. NEW YORK

Technical Report No. 15

ONR-27 1 24 Geol.

Technical Report No. 1 2

CU-35-56 NObsr-64547

PRECISION DEPTH RECORDER MK V

January 1956

LAMQNT GEOLOGICAL OBSERVATORY
(COLUMBIA UNIVERSITY)
PALISADES, NEW YORK

Technical Report No. 1 5
ONR-2712U Geol.

Technical Report No. 12
CU-35-56 NOBsr 6U5U7

PRECISION DEPTH RECORDER MK V

BERNARD LUSKIN* AND HERBERT G. ISRAEL**

January 1956

* Lamont Geological Observatory, Palisades, New York
** Times Facsimile Corporation, New York 19, New York

FIG. 1. PDR MK

FOREWORD

This report consists of an instruction manual prepared by the authors
for use with the Precision Depth Recorder MX V equipment. The manual was
written to accompany several of these equipments built for the Western
Electric Company 'under Contract XFE 10^982 with the Times Facsimile Corporation.
Consultant services in the design, development and construction were provided
by the Lament Geological Observatory. These services were performed under
the sponsorship of the United States Navy under contracts N6-onr-271 TO 2k
with the Office of Naval Research and NObsr 61;5U7 with the Bureau of Ships.

In response to many queries, this manual is here published as a technical
report to provide detailed technical information to those individuals and
organizations interested in building precise depth recording systems. The
design of this equipment is based upon a simplification of the Model MK
IV-Ae several of which have been in service at sea for about one year.

(See Reference A). The size of the MK IV-A has been reduced by one-half and
the circuitry and operating controls have been greatly simplified. All
previous models of the PDR, MK I-MK IV, have been essentially rough adaptions
of Facsimile Recorders. The MK V equipment represents the first model of
the PDR which has been built specifically for the job of recording echo
sounding pulses on an expanded scale with high precision.

This publication is for technical information only and does not
represent recommendations or conclusions of the sponsoring agencies.
Reproduction of this document in whole or in part is permitted for any
purpose of the U.S. Government.

TABLE OF CONTENTS

SECTION ONE - GENERAL DESCRIPTION

Page

I. INTRODUCTION . 7

II. PURPOSE AND BASIC PRINCIPLES . 7

A. PURPOSE . 7

B. BASIC PRINCIPLES . 7

(1) Sounder Unit Functions . ... 7

(2) Function of the PDR . 8

(3) Programmed Gating Operation . . 8

(U) Time Correlation . 10

(!?) Vertical Scale Exaggeration . 10

(6) Base Line Determination . . 10

C. GENERAL DESCRIPTION . . 10

(1) Cabinet . . 10

(2) Mechanical Unit . . . 10

(3) Electronic Unit . 12

D. APPLICATIONS . 12

SECTION TWO - THEORY OF OPERATION
I. INTRODUCTION . 13

A. GENERAL . 13

B. SONAR SOUNDING SET . 13

C. PRECISION DEPTH RECORDER . 13

(1) Functions . 13

( 2 ) Gating System, General ••••• . 13

-2-

Page

(3) 12 -Second .Cycle . 15

(U) 2U-Second Cycle . . . • • • • 15

(5) lUU-Second Cycle . ... . . . 15

II. DESCRIPTION OF UNITS AND CIRCUITS . 17

A. SONAR SOUNDING SET . 1?

(1) General . . . . . 17

(2) Motor Drive . 17

(3 ) Keying Leads . . . . . . . 17

(h) Earphone Output Jack . 17

B. PRECISION DEPTH RECORDER . 17

(1) Cabinet . . 17

(2) Mechanical Unit . 18

a. Printing . . 18

b. Recorder Drive . . 18

c. 20 Fathom Mark Generator . . 31

d. Program Assembly . 31

e. Keying Contacts . . . . . 31

f • Keying Gate Cams ••••• . . 3h

g. Receiving Gate Cams . . . . 3U

h. Time Marks . . . ••••• 35

i. Time Phasing . 35

(3) Electronic Unit . 36

a. Power Supply . . . 36

b. Fork-controlled Oscillator . 36

c. Sync Motor Amplifier . . 39

d. Print Amplifier . 1|0

e. Fathom Mark Amplifier . 1|1

f. Rear Panel . ill

g. Front Panel . UU

h. Test Points . . U5

SECTION THREE - INSTALLATION

I. UNPACKING . i|6

Cl. SELECTION OF SITE . 1|7

III. INSTALLATION . Il7

-3-

Page

SECTION FOUR - OPERATION

INTRODUCTION . U9

OPERATING PROCEDURES . U9

A. STARTING THE EQUIPMENT . U9

B. SETTING THE GAIN . U9

C. DEPTH SELECTOR . 50

D. PING LENGTH . 50

E. EVENT MARKER . 50

F. TIME MARK PHASING . 50

G. BASE LINE DETERMINATION . 50

SECTION FIVE - OPERATOR'S MAINTENANCE

INTRODUCTION . £2

MAINTENANCE PROCEDURES . . 52

A«, LOADING PAPER ROLL . 52

B. LOADING TAKE-UP REEL . 52

Co CHANGING STYLUS . 53

D. KEYING CONTACTS . 53

ROUTINE CHECK LIST . 53

SECTION SIX - TROUBLE SHOOTING, ADJUSTMENTS, AND REPAIR

GENERAL . 55

TROUBLE SHOOTING BY THE OPERATOR . 55

A, FAILURE TO START . 55

B« FAILURE TO SYNC . 55

C. PAPER FEED FAILURE . 55

D. STYLI NOT PRINTING . 55

Eo CONTINUOUS PING . 56

TROUBLE SHOOTING PROCEDURES . 56

A. GENERAL . 56

-U-

Page

B. ISOLATION PROCEDURE . 5 6

Co TROUBLE CHART . o . 57

IV. PREVENTIVE ROUTINE MAINTENANCE, LUBRICATION . 58

A. PREVENTIVE MAINTENANCE . 58

B. LUBRICATION . 59

V. MECHANICAL ADJUSTMENTS AND REPAIR . 59

A. STYLUS HOLDER ASSEMBLY, ADJUSTMENT & REPLACEMENT 59

B. ADJUSTMENT OF STYLUS PRESS SPRING . . 61

C. REPLACING STYLUS BUSHING . 61

D. CHANGING THE STYLUS BAND . 62

E. REMOVAL OF THE MECHANICAL UNIT . 62

Fo REPLACING KEYING CONTACTS . . 62

VI. ELECTRICAL ADJUSTMENTS AND MEASUREMENTS . 63

A. SYNC DRIVE . 63

B. 20 FATHOM MARK DENSITY . 63

Co LINE VOLTAGE . 63

D. SOCKET VOLTAGE MEASUREMENTS . 6h

E. SOCKET RESISTANCE MEASUREMENTS . 66

SECTION SEVEN - SPARE PARTS LIST . 67

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LIST OF ILLUSTRATIONS

Title

PRECISION DEPTH RECORDER MARK V .

PDR MK V MAJOR UNITS .

BLOCK DIAGRAM PDR MK V .

KEYING AND RECORDING PROGRAMS .

MECHANICAL UNIT FRONT VIEW .

MECHANICAL UNIT REAR VIEW .

DRIVE SYSTEM SCHEMATIC .

SYNC GEAR BOX, TOP VIEW .

SYNC GEAR BOX .

RUN GEAR BOX .

MECHANICAL UNIT, REAR VIEW, PROGRAM .
ASSEMBLY REMOVED

PROGRAM ASSEMBLY IN PLACE .

PROGRAM ASSEMBLY, FRONT VIEW .

PROGRAM ASSEMBLY , TOP VIEW .

PROGRAM ASSEMBLY, BOTTOM VIEW .

PROGRAM ASSEMBLY, REAR VIEW . .

SIMPLIFIED SCHEMATIC, KEYING GATES ..
SIMPLIFIED SCHEMATIC, RECEIVING GATES

ELECTRONIC UNIT, TOP VIEW .

ELECTRONIC UNIT, BOTTOM VIEW .

ELECTRONIC UNIT, REAR VIEW .

ELECTRONIC UNIT, FRONT VIEW .

PDR MK V CIRCUIT DIAGRAM .

STYLUS HOLDER ADJUSTMENT

-6-

LIST OF REFERENCES

A* "Precision Depth Recorder NIK IV -A", Luskin and Roberts, Technical Report
No. 7 N6-onr-2712U Geol., Lamont Geological Observatory, Palisades, New
York.

B. "Precision Measurement of Ocean Depth", Luskin, Heezen, Ewing and
Landisman, DEEP SEA RESEARCH, Vol. I, No. 3.

C. NAVSHIPS 91U20 Instruction Book for Sonar Sounding Set AN/UQN-1B.

D. INSTRUCTION MANUAL FOR WEATHERFAX RECORDER MODEL RJ-2, Times Facimile
Corporation, New York 19, New York.

SECTION ONE

GENERAL DESCRIPTION

I. INTRODUCTION

This instruction book covers the essential information for installation,
operation and maintenance of the Precision Depth Recorder MARK V. This
equipment is the fifth model in a series of recorders originally conceived
and developed by members of the staff of the Lamont Geological Observatory
of Columbia University. Precision Depth Recorders have been in operation
on the Research Vessel Verna, the University's oceanographic research ship,
for more than three years. Several of the MK IV type have been in operation
on various ships of the U.S. Navy for almost one year.

The MARK V equipment represents a considerable simplification over
the MARK IV although the basic principles of operation are the same. The
equipment has been reduced in size by one-half. The circuitry and front
panel controls have been greatly simplified. Several components which
required considerable maintenance, particularly the keying contacts, have
been redesigned to insure greater reliability.

Aboard the Verna, the complete recording system consists of two
recorders: the expanded scale recorder described here and a synchronized
compressed scale recorder, referred to as a Slow Drum. The latter has
three main purposes: (l) To aid in resolving the base line of the expanded
scale recorder; (2) To provide a summary of the general topography over a
wide area on a compact record; (3) To provide an easily reproduced record
for publication purposes. The MARK V equipment described here includes
provision for connecting a Slow Drum, if required.

II. PURPOSE AND BASIC PRINCIPLES

A. PURPOSE

A sonic sounding system is used to obtain nearly continuous records
of ocean depth. The PDR equipment is used to supplant the recorder unit of
conventional Sonar sounding equipment. The PDR provides a sounding record with
a scale expansion and an accuracy completely beyond the capabilities of con¬
ventional sounding equipments •

The scale of the MK V recorder is 18.85 inches equals I|C0 fathoms or
about 1 mm. equals 1 fathom; the estimated accuracy is at least one part
in 3000 exclusive of uncertainties in the average vertical velocity of
sound. Thus, the record gives a reliable picture of the sea bottom in fine
detail. The equipment will operate in any depth of water, being limited
only by the power capabilities and signal/noise ratio of the Sonar sounding
set installation.

B. BASIC PRINCIPLES

(1) Sounder Unit Functions

A sonic sounding system consists of transducer, transmitter,

receiver and recorder. The transducer converts electrical energy supplied
by the transmitter into sound energy which propagates through the sea water
and is reflected from the bottom. The reflected sound energy is then con¬
verted into electrical energy by the transducer and supplied to the receiver.
The receiver feeds the electrical energy of both the outgoing and reflected
pulses (pings) into the recorder. The function of the recorder is to time
the interval between the transmission and reception of the pings and display
the time difference information so that it may be converted easily into
depth information. The latter conversion presumes a knowledge of the average
vertical velocity of sound.

(2) Function of the PDR

The Precision Depth Recorder performs only the recording function. It,
is intended to be coupled to the transducer, transmitter and receiver of a
conventional deep-water echo-sounder such as the Sonar Sounding Set AN/UQN-1B
in place of the recorder units ordinarily supplied with these equipments.

The PDR performs the timing function, under ordinary operating conditions,
to better than one part in 1,000,000. It displays the timing information
on a highly expanded scale so that the fine detail of the bottom is recorded.
This high precision is made possible by the tuning-fork-controlled, slip-
free drive of the Facsimile -type Recorder. Assuming one millimeter to be
the smallest readable unit, the uncorrected depth, as read from the record,
is good to t one fathom. (Conventional echo sounding practice uses a
standard velocity of sound of 800 fathoms/second to convert time measurements
into depth. This is referred to here as the uncorrected depth).

(3) Programmed Gating Operation

Under favorable operating conditions, the operation of the recorder
system is simple. A recording stylus scans the record sheet once per
second; one ping is transmitted every second at the beginning of the scan]
one ping is received every second and recorded at some time during the scan.
This mode of operation gives the maximum density of sampling, of which the
recorder is capable, (60 pings per minute), and is referred to as HDR,
high Density Recording.

HDR is always used in depths of water down to 1^00 fathoms - in such
relatively shallow water, the returning echo is strong. In deeper water,
where the echoes are weaker, it is not always possible to use the HDR type
of recording because the recording of the outgoing ping and reverberation
uses up the available dynamic range of a portion of the recording paper
which may include the record of the echo. Recording of the scattering
layer, especially under noisy conditions, sometimes eliminates a portion
of the useful recording area. Poor bottom reflectivity and detuning
of the Sonar Receiver may also contribute to low signal/noise ratio.

For such operating conditions, a programming unit is included in the
equipment which permits the transmitter and recorder to operate in a preset
sequence arranged to minimize the noise on the record while preserving the
maximum density of sampling.

FIG

(U) Time Correlation

For survey purposes ocean depth information is useful only if coordinated
with geographical position. Since usual navigation procedure relates geo¬
graphical position with time (of day), it is practical to display the depth
information as a function of time. A cam-switch mechanism is included in
the equipment which provides a time mark every three minutes. A phasing
clutch mechanism operates the switch so that the recorded time marks may be
synchronized, by the operator^ with WV or the Ship’s chronometer.

(5) Vertical Scale Exaggeration

The vertical exaggeration of the PDR sounding record is a function of
ship’s speed only since the depth scale is fixed at i|00 fathoms equals 18.85
inches and the paper traverse speed is fixed at 2l+ inches per hour. A ship
operating at 15 knots would have a record exaggerated in the vertical scale
by about 30:1. At five knots the exaggeration would be approximately 10:1.

(6) Base Line Determination

The sounding record does not determine the value of the base line,
which may represent any multiple of I4.OO fathoms. An auxiliary Slow Drum
recorder, operating in synchronism with the expanded scale recorder readily
provides the base-line factor, however, there are several other methods
available to the operator for obtaining this information without a Slow
Drum. (See SECTION FOUR, Par. II-G).

C. GENERAL DESCRIPTION

(1) Cabinet

The FDR MK V is contained in a cabinet supported on four shock-
mounts. Mounted in the cabinet are an exhaust blower, a Mechanical Unit
Assembly, and an Electronic Unit Assembly. A paper take-up mechanism
is mounted on the hood cover. Figures 1, 2, and 3 show the completely
assembled equipment.

(2) Mechanical Unit

The Mechanical Unit is a continuous web-type recorder feeding
paper from a 350 foot roll. Three printing styli are mounted on a band
assembly which is driven by an induction motor and restrained by an 1800-
cycle synchronous motor of the phonic type. The record is printed by
burning away the white paper surface with an electrical discharge between
the stylus and the frame (ground), thus revealing the black undercoating.

The Mechanical Unit contains a program assembly which provides the
various contacts for keying and gating the transmitter and receiver, a 20
cps generator which provides pulses for recording 20 fathom divisions on
the UOO fathom record scale, a time-mark switch which interrupts the 20
fathom marks to provide three minute time breaks on the record, and a phasing
clutch which enables the operator to synchronize the time marks with the
Ship’s time standard.

(3) The Electronic Unit

The Electronic Unit contains all the circuitry and controls for
coupling the PER to the Sonar Sounding Set and operating the complete system*
The Electronic Unit consists of a Power Supply, an 1800-cycle Fork-Controlled
Oscillator, a Sync Motor Amplifier and a Print Amplifier. The cabling
connections are made on the Rear Panel. The operator’s controls and indicators
are on the Front Panel. The Mechanical Unit mounts over the forward end of
the Electronic Unit Chassis and one cable interconnects the two units.

D. APPLICATIONS

The PDR MK V is used for recording sonic soundings in place of the
recorder units supplied with conventional sounding gear. It is intended for
use in deep water surveys inhere high precision and fine details of relief
are required.

.For further information on the background and applications of PDR
equipment, see Reference B.

SECTION TWO

THEORY OF OPERATION

I. INTRODUCTION

A. GENERAL

The Precision Depth Recorder is a precise timing device which displays
the time difference between transmitted and bottom-reflected sonic pulses
on an expanded scale. The correlation of this displayed information with
the actual ocean bottom topography depends upon many factors beyond the
scope of this manual. For present purposes, it is considered that the
record obtained is a representation of the ocean bottom beneath the ship
and gives the depth in fathoms.

B. SONAR SQUID INC SET

The Sonar Sounding Set is the basic equipment for recording depth.

The PDR is intended to replace the recorder unit of conventional sounders
which do not provide the expanded scale and high precision required for
detailed surveys. Hereafter, the Sounding Set referred to will be the
Sonar Sounding Set AN/tfQN-lB. Complete information on this equipment is
contained in Reference C. For present purposes, this equipment may be
considered to consist of a transducer, transmitter and receiver. The
transmitter energizes the transducer when it is keyed by a grounding
contact. The receiver passes and amplifies both the transmitted and
bottom-reflected pulses. The output of the receiver is available at a
high-level low- impedance outlet.

C. PRECISION DEPTH RECORDER

(1) Functions

The PDR has two main functions: (l) to provide a display of the
sonic pulse time-difference information in a precise and integrated manner;
(2) to provide a keying contact for the Sonar transmitter. In addition,
there arc several auxiliary functions: (1) to provide 20 fathom divisions
on the I|00 fathom scale record for ease of reading depth precisely; (2)
to provide a time break on the record so that the depth may be related to
geographical position by correlation with the ship's log; (3) to provide
a means of synchronizing the record time breaks with the Ship’s time
standard; (U) to provide a programmed gating system. Figure U shows the
functional relationship of the various units.

(2) Gating System, General

The Gating System in the MK V Recorder is designed to allow a
maximum density of sampling and a maximum signal/noise recording ratio
while preserving the greatest simplicity of operation. In the range 0-1500

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fathoms, the operation of the recorder is simple: one ping it transmitted
at the beginning of each stylus scan, once per second, and, of course, one
ping is received as a bottom reflection per scan. This mode of operation
can be used in any depth of water. However, in depths greater than 1500
fathoms, the echo is usually too weak to show through the accumulated noise.

In the range 1500-3000 fathoms, a program of keying and recording is con¬
trolled by cams operating on a 12 second cycle; in 3000-6000 fathoms, the
cycle length is 2h seconds. In addition, if a Slow Drum is used in synchronism
with the expanded scale recorder, a li\h second cycle program is available
for control of the Slow Drum program.

The operation of the cycles is shown diagr aromatically in Figure 5*

Zero time is the time of the start of the first of a group of pings. It
is also the time of the start of a stylus scan across the recording paper.

(3) Twelve Second Cycle

Consider the twelve second cycle. The keying gate opens just
before zero time and closes just after the fifth second, thus allowing
six pings to be transmitted every twelve seconds. The recording gate
opens at second 3 <>5, so that two of the six outgoing pings are recorded and
also all the reflected pings between 3*5 and twelve seconds. The recording
gate is open for eight and one-half scans of the stylus. For depths between
1500 and 2800 fathoms, six of the eight and one-half scans will print an
echo return; for depths greater than 2800 fathoms only five or less returns
will be recorded.

(ii) Twenty-four Second Cycle

Consider the 2h second cycle. The keying gate opens just before
zero time and closes just after the eleventh second, thus allowing twelve
pings to be transmitted every twenty-four seconds. The recording gate
opens at second 7*5, so that four of the twelve outgoing pings are recorded
and also all the reflected pings between 7*5 and 2U seconds. The recording
gate is open for sixteen and one-half scans of the stylus. For depths
between 3000 and 5200 fathoms, twelve of the sixteen and one-half scans,
will print an echo return; for depths greater than 5200 fathoms only eleven
or less returns will be recorded.

(5) lUU Second Cycle

Consider the lhh second cycle. This is used for gating an auxiliary
blow Drum recorder with a full scale of 2l|00 fathoms (6 seconds per scan).

The keying gate, which supersedes the twelve and twenty-four second cycle
gates in the circuit, allows 120 seconds of operation as described above.

During this time the receiving gate of the 2h00 fathom scale recorder is
closed and the keying gate is open. Just before second number 120 in the
cycle the keying gate closes for five seconds, opens then for one second
allowing only one ping to be transmitted, then opens again before second
2h to allow another 120 seconds of normal expanded scale recording. The
blow Drum receiving gate opens in time to record the single ping transmitted
and closes just before normal operation begins again. Thus the density of
sampling for the Slow Drum is one ping every II4.J4. seconds. TTien there is no

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auxiliary Slow Drum recorder, the lhh second keying gate is bypassed and
the normal expanded scale recorder programs are not interrupted.

II. DESCRIPTION OF UNITS AND CIRCUITS

A. SONAR SOUNDING SET

(1) General

The circuits of the Sonar Sounding Set AN/UQN - IB are described
in Reference C. Only those parts of the circuit which have to do with
the PDR equipment will be considered here. These are: (l) Motor Drive;

(2) Keying Leads; (3) Earphone Output Jack. The illustrations referred
to in this paragraph ( II-A) , are to be found in Reference C.

(2) The Motor Drive

The Motor Drive of the Sounder is connected for a separate 60 cps
115 V source as shown in Figure 3-3 , Reference C. If it is desired to run
the Sounder Recorder at times, the AC source for the drive motor may be
switched. In any case, the motor should be disconnected while the PDR
is operating.

The styli must be prevented from recording on the chart area or
overloading of the final receiver stage with consequent damage to components
will result. The belt holding the recording styli may be advanced manually
until neither one of the styli is in contact with the paper; or the connection
to the trolley bar may be broken. If it is desired to be able to put the
Sonar Set in normal operation quickly; this latter connection may be switched.

(3) The Keying Leads

The Keying Leads are normally connected to the keying contacts,

S-201 (Figure 2-9)* These are disconnected, and led, through a shielded
cable, to the PDR KEYING LEAD jack. If It is desired to operate the Sounder
at times, the keying leads may also be switched.

(h) The Earphone Output Jack

The Earphone Output Jack is used as the source of signal for the
PDR. A shielded cable leads the signal from this point to the PDR INPUT
jack. The PHONES jack, on the PDR front panel, may be used for monitoring.

In order to reduce the line impedance of the signal lead, Condenser
C-221 (Reference C), 680 MMF., is shunted by a 0.1 MFD, 600 v condenser.

Aside from the circuit changes mentioned above, the Sounder is
operated as usual.

B. PRECISION DEPTH RECORDER

(l) Cabinet

The PDR MK V is contained in a cabinet supported by four shock mounts.

A small hinged cover plate allows access to the front panel operating
controls. A paper take-up mechanism, including a small AC motor, a friction
clutch and suitable supports for the take-up spool, is mounted on the hood.

A lucite window is provided to obtain a clear view of the styli when the
hood is in place. Inside the cabinet are the Mechanical Unit, the Electronic
Unit, and an exhaust blower, connected by hose to the Mechanical Unit, which
removes the waste particles created by the recording process. The blower
and take-up motors are cable-connected to the AC line through J7-P7 and
J8-P8 respectively, and are energized by the Power Switch in the RUN
position. (See Figure 2U).

(2) The Mechanical Unit

The Mechanical Unit contains all the mechanical apparatus required
to perform the recording function and all the auxiliary devices required to
synchronize the operation of the PDR with the Sonar Sounding Set. Connection
to the Electronic Unit is made through PI, a 23-pin receptacle mounted on
the program assembly. General views of the Mechanical Unit are shown in
Figures 6 and 7*

a. Printing

Printing of the paper is done by three styli equally spaced on
a band assembly. Signal power is fed to the styli through contact between
the styli bushing holders and a Trolley Bar mounted on the front of the
Mechanical Unite The Trolley Bar also helps smooth out the traversing
motion of the styli.

The band is driven by a single phase induction Run Motor and
restrained by a phonic-type Sync Motor so that each stylus scans the width
of the recording chart once per second. The chart paper is fed from a roll
at 2k inches per hour.

b. Recorder Drive

Refer to Figures 8 - 11, showing detailed views of the
Recorder driving system and Figure 2k > the complete circuit diagram.

The Recorder is set in operation by the four-position power
switch, SI. Refer to Sl-E and Sl-F in Figure 2U* In OFF position, both
sides of the 11 f?V, 60 cps line are disconnected from the Mechanical Unit.

In START position, the START MOTOR is energized and brings the SYNC motor
above synchronous speed. In SYNC position, the SYNC MOTOR is energized
and drops into synchronous speed, 1800 RPM. The START MOTOR is still
energized through ballast tube V103 at this stage to provide some damping
force on the SYNC MOTOR. Other than this damping force, there is no
appreciable load on the SYNC MOTOR, since the latch mechanism linking it to
the rest of the drive system slips freely when the RUN MOTOR is stopped.

In RUN position, the START MOTOR is disconnected and the RUN MOTOR is
energized through ballast tube V103* which regulates the RUN MOTOR current.
The RUN MOTOR drives the Band Assembly which engages the SYNC ARM by means
of the lug projections on the stylus holders. The SYNC ARM is connected

TROLLEY BAR PLATEN FATHOM FRONT PAPER GUIDE

MECHANICAL UNIT FRONT VIEW

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FIG. 7. MECHANICAL UNIT REAR VIEW

In Pig* 2 which shows the Mechanical drive
assembly^ the band 1 carrying the stylus holders 2
Is driven by the n on-synchronous run motor 3
through the reduction gears.

The stylus holders 2 have lug projections that
catch on the holdback arm 5 which cannot be pulled
above synchronous speed (see Pig* 3)# The wheel

18 rotates freely about the shaft 19* The shaft

19 of the hold-back arm 5 drives the collar 6
upon which is attached the drive dog 7* The run
motor 3 tends to drive the system above synchronous
speed, thus causing the drive dog 7 to rotate until
it engages the latch 8 mounted on the collar 9*

The collar 9 Is geared to the synchronous motor

so as to run at synchronous speed* The drive back
to the synchronous motor is through the gear 17*

When starting up the system preparatory to
recording, the synchronous motor 13 is first brought
up to speed by the start motor 14* There is no
load on the synchronous motor because the latch 8
trips over the drive dog 7 which is not rotating*

When the run motor 3 starts up, it speeds up
until the drive dog 7 catches up with the latch 8*
The band 1 is then held down to synchronous speed*
When the run motor stops the synchronous system
between motor 13 and latch 8 continues to rotate

Fiff. •?. Recorder Si if! us

mid Drive Dug Assembly.

Fig. 8. Drive System Schematic

SYNC GEAR BOX TOP VIEW

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through gearing to the latch mechanism which engages the SXNC MOTOR drive*
After engagement, the band assembly is constrained to a precise speed of
on® scan per second. In order to avoid knocking the SYNC MOTOR out of
synchronism (and thus stalling it), the RUN MOTOR drive includes a friction
clutch which slips under the impact of the latch engagement.

c* Twenty Fathom Mark Generator

The SYNC MOTOR also drives the rotating cam armature of a
20-cycle pulse generator* This generator is of the variable reluctance
type* The stator consists of a coil wound around a permanent magnet
core* The magnetic flux path is completed by the rotating cam* Due to
the variation of reluctance in the circuit, a voltage is induced in the
coil whose wave shape closely approximates the physical developed shape of
the cam* In this case, sharp pulses are generated which are printed as
precise 20 fathom divisions of the U00 fathom record scale. A lucite bar,
mounted on the front of the Mechanical Unit, has numbered graduations which
serve as a guide in identifying the 20 fathom mark divisions*

d. Program Assembly

The auxiliary devices include the Keying Contacts, the
Gating Cams, the Time Mark Interrupter and the Time Phasing Components*
These are all contained in one Program Assembly which is completely de¬
tachable from the rest of the Mechanical Unit, (Figures 12 and 13).
Mechanical connection is made to the RUN MOTOR through the Meshing
Gear (Figure lU), and electrical connection to the Electronics Unit is made
through P2-J2 and Pl-Jl.

Refer to Figures 15 and 16, showing detailed views of the
Program Assembly components and to Figure 2h»

The Keying Contacts are driven by a shaft rotating at one
revolution per second. The group of four Gating Cams, Nos. 1-1;, for the
expanded scale recorder program are driven by a shaft making one revolution
in 2h seconds* Cams 5 and 6, the Slow Drum Gating Cams are driven by a
shaft making one revolution in II4.I4. seconds. The Time Mark Interrupter
Cam and Clutch are on a shaft making one revolution in three minutes.

e. Keying Contacts

The Keying Contacts provide the ground connection required to
key the Sonar Set Transmitter. Refer to Figure 17 which shows the Keying
Contacts in detail and to Figure 2ip •

The Long Key Block carries a leaf-spring arm which connects
contact shoes 1 and 2. The Short Key Block carries a leaf -spring arm which
connects Contact Shoes 3 and U. The width of the contact shoes is such as
to make the duration of electrical contact 20-30 milliseconds. Contact
3— U is connected in series with Contact 1-2* The Short Key Block is
adjusted on the 1 RPS shaft in relation to the Long Ke^ Block so that cent a
3-1; breaks 3-5 milliseconds after Contact 1-2 makes. Thus Contact 3-U
determines the end of a short ping and Contact 1-2 determines the beginning

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RECEIVING? GATES

FIG. 19

of the short ping. Switch S6 on the Front Panel may be used to short out
Contact 3-Ue Then Contact 1-2 determines both the beginning and end of the
long ping whose duration corresponds to the full width of the shoe contact,
20-30 milliseconds. The beginning of the keying pulse is synchronized with
the beginning of the stylus scan by proper engagement of the Meshing Gear when
the Program Assembly is mounted on the Mechanical Unit.

f . Keying Gate Cams

The Gating Cams provide the switching cycles which control
the operation of the Keying Contacts, the Print Amplifier, and the Slow
Drum Recorder. The proper gating cycle for the depth of operation is selected
by the Depth Selector, S-2, on the Front Panel.

Refer to Figure 18, a simplified schematic of the keying
circuit, and Figure 2lj.

The Sonar Keying Lead, which must be grounded to key the
Sonar Set Transmitter, enters the FDR through Jiu The Power Switch,

Sl-B, connects the Keying Lead to the circuit only in the RUN position
so that if the Recorder happens to stop with the Keying Contacts grounding,
the Transmitter will not be energized indefinitely, a condition which would
cause component failures in the Sonar Set. The Keying connection is led
from S2-B to the microswitch Sll, controlled by Cam #5* This switch is
shorted out unless a Slow Drum Recorder is being used. (Slow Drum
'operation is discussed below). The keying connection is now switched by
Depth Selector S2-B. In the 0-1500 Fathom position, the Keying Lead is
connected directly to the Keying Contacts so that the keying rate is one
ping per secondc In the 1500-3000 Fathom position, the Keying Lead is
connected to the Keying Contacts through the microswitch S7, controlled by
Cam #1. This cam allows a keying rate of 6 pings, one second apart, every
12 seconds. In the 3000-6000 Fathom position, the Keying Lead is connected
to the Keying Contacts through the microswitch S8, controlled by Cam #2.

This cam allows a keying rate of 12 pings, one second apart, every 2k
seconds. The Ping Length Selector Switch, S6, allows choice of the short
(3-5 msecs) or long (20-30 msecs) ping duration as described above.

The Slow Drum Keying Program Cam, #5> operates on a lhh second
cycle. This cam allows the cycle operation described above for 120 out of
every lhh seconds, and controls the keying operation for 2h out of every
lUli seconds. Only one ping, the one that would be the sixth in the 12 and
2k second cycles, is allowed to be transmitted during the 2k second Slow Drum
period. This is necessary to prevent multiple bottom records being recorded
on the Slow Drum and rendering the compressed scale record valueless.

g. Receiving Gate Cams

Refer to Figure 19, a simplified schematic of the signal
input circuit, and Figure 21; •

The Sonar signal input enters the PDR through J3« After
passing through Gain Control, R201, and isolation resistor R202, the signal
is connected to the grid of amplifier tube V201A and subsequently passes
through the rest of the Print Amplifier to the stylus. Gating of the signal

is accomplished by grounding or not grounding the grid of V201A. This
grid is connected to Depth Selector Switch S2-A. In the 0-1500 Fathom
position, the grid is never grounded so that signal passes through the Print
Amplifier continuously. In the 1500-3000 Fathom position, the grid is
grounded through the microswitch S9> controlled by Cam #3. This cam is
synchronized with the Keying Gate Cam #1 so that only the last 2 of the
6-ping group are recorded and signal is passed through in the last 8 1/2
seconds of every 12 second cycle. In the 3000-6000 Fathom position, the
grid is grounded through the microswitch, S10, controlled by Cam #U. This
cam is synchronized with the Keying Gate Cam #2 so that only the last U of
the 12-ping group are recorded and signal is passed through in the last
16 l/2 seconds of every 2li-second cycle.

The Sonar Signal is also led from J3 directly to the microswitch,
S12, controlled by Cam #6. This cam controls the input to the Slow Drum
Recorder. For most of its Ihh second cycle, it grounds the Slow Drum signal
input. It is synchronized with Cam #5 so that signal is passed through
the Slow Drum Print Amplifier just in time to record the single ping of the
Slow Drum 2ii-second recording period. The Slow Drum input is grounded again
just before the end of this period.

h. Time Marks

Refer to Figures 15 and 16 and Figure 2!;.

The Time Mark Interrupter Cam operates on the 1/3 RPM shaft.

It controls microswitch S5 which connects or disconnects the 20 cps generator
pulses to the Fathom Mark Amplifier, V203B. The cycle is arranged to allow
a 15 second interruption every three minutes. During this 15 second period,

S5 shorts the generator coil to ground, interrupting the printing of the
20 Fathom lines on the record, and causing the Time Indicator Light on the
Front Panel to extinguish. During the remainder of the three minute period,

S5 completes the Time Indicator Light circuit and allows the 20 cps pulses
to be printed.

i. Time Phasing

The Time Mark Interrupter Cam is driven by the 1/3 RPM shaft
through the Phasing Clutch. The Phasing Clutch consists of a spring-loaded
pawl and a ratchet wheel with an extended stop-arm. The stop-arm may be
engaged by the armature of the Phasing Clutch Relay which is controlled by
Time Phase Switch, SU on the Front Panel. When SU is in RELEASE position,
the Phasing Clutch Relay is energized, the armature is lifted, and the Phasing
Clutch is engaged. When SU is in PHASE position, the Phasing Clutch Relay
is de-energized, the armature drops and. engages the extended stop-arm of the
ratchet wheel when it comes around. With the ratchet wheel held, the pawl
slips and the Time Mark Interrupter Cam stops moving. The Time Mark
Interrupter Switch, S5> is adjusted so that it is now at the extreme end of
the interruption period. If the Time Phase Switch, Sli, is now snapp>ed to
RELEASE position, the clutch will engage and the 20 Fathom marks will
immediately start printing on the record. If this last operation is
synchronized with the Ship's time standard on some multiple of three minutes,
the end of each interruption period (or the beginning of each 20 Fathom Mark
printing period) will represent a three-minute time break in terms of Ship's
time.

Note that since all the shafts in the Program Assembly are
driven from RUN MOTOR gearing, when the RUN ROTOR stops, the Program Assembly
ceases to function. Mienever the RUN ROTOR is stopped, e.g., when loading
a new chart roll, the Tine Phasing procedure must be followed again, since
synchronization of the record time breaks with the Ship's time is lost*

(3) The Electronic Unit

The Electronic Unit contains all the circuitry required to control
the operation of the PER coupled to a Sonar Sounding Set. Connection to the
Mechanical Unit is made through Jl, a 23-terminal cable connector leaving the
Electronic Unit from the top. General views of the Electronic unit are shown
in Figures 20 and 21. The complete circuit diagram is shown in Figure 2h.

a. Power Supply

This circuit supplies unregulated B+ power at 300 volts DC,
regulated 3+ power at 150 volts DC, and filament power at 6*3 volts AC to
the electronic circuits. It also aipplies unregulated 20 volt DC power to
the Phasing Clutch Relay circuit*

Single-phase, 115 V, 60 cps powder enters the PDR through the
line cord at the Rear Panel* Power fuse FI, rated at 3 amperes protects the
circuits from overload and the neon pilot lamp indicates its failure. Power
Switch Sl-A connects line voltage across the primary of the Power Transformer,
T101. The primary has three taps which may be selected by S3 on the Rear
Panel for the appropriate line voltage* The secondary has a 6*3 volt winding
for filament power and a 5 volt and high voltage winding which feed a
conventional power supply circuit utilizing a choke-input filter, high
voltage rectifier tube V101, a 5RU* and regulator tube, V102, a GA2, were
chosen because they are used in the AN/UQN-IB Sonar Sounding Set and therefore
simplify the spare parts requirements. Fuse F2, rated at l/U ampere, protects
the high voltage supply and has a neon indicator in parallel. The 20 volt
DC supply for the Phasing Clutch Relay is tapped off the high voltage through
R101 •

b. Fork-Controlled Oscillator

This is a plug-in unit located at the rear of the Electronic
Unit which generates an 1800-cycle signal for synchronous motor operation and
for use as an Event Hark signal. The unit consists of an 1800-cycle tuning
fork, whose output is amplified by three stages of amplification, with
positive feedback to drive the fork.

The 1300-cycle fork has a pick-up coil which provides a signal
to the first amplifier stage, V301A, and a drive coil which accepts a feed¬
back signal from the power amplifier stage, V301B.

The 1800-cycle fork signal from the fork pick-up coil is
applied through a shielded lead to the grid of the fork amplifier, V301A,
a half section of a 6SN7. V301A is a class A amplifier with an unbypassed

cathode resistor R311 to provide inverse feedback for this stage to stabilize
the circuit. The amplified 1800-cycle signal is resistance-coupled through

1800 CPS FORK-CONTROLLED
OSCI LLATOR

FIG. 20. ELECTRONIC UNIT TOP VIEW

ELECTRONIC UNIT BOTTOM VIEW

capacitor C302 to the control grid of V302, a 6AG7.

V302 is connected as a conventional pentode amplifier and
operates as a fork limiter stage. Sufficient signal is delivered to the
control grid of this stage to cause plate current limiting. This action
results in a constant level output, regardless of the input signal received
from V301A over the operating range of the fork.

The output of V302 is coupled through capacitor C30U, R308
and R310 to the grid of V301B, which acts as a power amplifier feeding the
drive coil of the fork. Resistors R308 and R309 form a voltage divider to
reduce the input signal to V301B.

A variable wire-wound resistor, R312, in the cathode circuit
of V301B controls the frequency of the fork oscillator. When this resistor
is set at the minimum value, maximum signal is delivered to the fork drive
coil. This causes the fork to vibrate at a frequency slightly lower than
1800 cycles. With R312 adjusted for maximum resistance, a minimum signal
is applied to the fork drive coil and the fork vibrates at slightly more
than 1800 cycles. The total range of amplitude variation on the fork drive
coil is approximately 8 to 1. This results in a frequency variation of
approximately plus or minus 0.0U cps from the tuning-fork center frequency
of 1800 cycles.

The output from the fork-controlled oscillator is obtained from
isolating resistor R307. This output feeds through P6-pin 6 to provide signal
for the Sync Motor Amplifier circuit. P6-pin 3 connects the circuit return
to B- (Chassis Ground) and Pin U connects the circuit plate supply to the
decoupling filter, R216, C208, and the 15>0 volt DC regulated supply. Filament
voltage is brought in to the plug-in unit through pins 10 and 15.

Co Sync Motor Amplifier

The motor amplifier comprises two stages: V203A, which serves
as a buffer stage to isolate the fork oscillator from the motor power circuits
and provides sufficient amplification to drive the power stage; and V20U,

V205>, the motor amplifier tubes, which provide the power to operate the
synchronous motor.

The 1800-cycle signal from the fork-oscillator unit connects
to variable resistor R213 and then to the grid of the buffer motor-driver
tube, V203A, one half section of a 6SN7. This stage is a transformer-coupled
amplifier with an unbypassed cathode resistor, R2II4., to provide greater
stability. R213 controls the amplification of this stage to provide the
proper amount of driving power for the motor amplifier tubes V20U and V20£.

The output of V203A is coupled through transformer T203 to
the grids of the motor amplifier tubes, two 6SN7GTAfS connected in push-pull.
These are operated as Class AB amplifiers, self -bias being supplied by
cathode resistor R215 and bypass capacitor C205. The ground return of this
stage is controlled by Power Switch Sl-D which makes the ground connection in
the SYKC and RUN position only. This is done to prevent SYNC motor power being
applied until the START MOTOR has brought it up to speed.

The output of V203A is also coupled to the Slow Drum Sync
Drive circuit through capacitor C209 and J5-P5>, pin C. This provides precision
1300-cycle voltage to the slow drum, and eliminates the need for another
fork-oscillator unit.

The output of V203A is coupled to the Print Amplifier through
C209, isolation resistor R12, and the Event marker Switch. Operation of the
Event Parker Switch, S6, on the Front Panel connects 1800-cycle voltage to
the grid of V201B in the Print Amp. and causes a black line to appear across
the width of the recording chart.

do Print Amplifier

The Print Amplifier comprises three stages : V201A, which

provides voltage amplification and serves as the gated tube for cycled
operation; V201B which provides a recording threshold above the normal noise
level and sufficient amplification to drive the power stage; and V202, which
provides power to the recording stylus needle.

The UOOO-cycle signal from the Sonar Set enters the Electronic
Unit through J3-pin B. The ground connection is carried on J3-pin A. Ear¬
phone Jack J6 is connected across J3 to provide a monitoring point in place
of the Sonar Set Earphone Output Jack used for transferring the signal to the
FDR.

The UOOO-cycle signal is connected from J3-pin B to R201, a
variable resistor which serves as the Gain Control for the Print Amplifier,
and then through isolation resistor R202 to the grid of V201A.

The signal is also connected from J3-pin B through Jl-Pl, pin
P to S12, the Slow Drum Receiving Gate, a cam-operated switch in the Program
Assembly. It is then connected through Jl-Pl, pin h. to the Slow Drum
receptacle, J5> on the Rear Panel.

The grid of V201A connects to the Depth Selector Switch S2-A
and thence to the receiving gate cam-operated switches in the Program Assembly.
Gating is accomplished by grounding or not grounding this grid.

V201A, a one-half section of a 6SN7, is a class A voltage
amplifier with cathode resistor R203 unbypassed to provide stability. The plate
impedance is provided by R20l| and the signal is coupled to the grid of V201B
through capacitor C201 and resistor R205.

V201B, a one-half section of a 6SN7 is operated as a trans¬
former-coupled amplifier normally biased to cut off. The cut-off bias, about
12 volts, is supplied by dropping resistor R206 and cathode resistor R207.

The cut-off bias operation of this stage sets a recording threshold for the
signal level and serves to eliminate low-level noise from accumulating on the
record and using up the dynamic range of the recording paper.

When the invent Marker Switch, S6, is operated, 1800-cycle
signal appears at the V201B grid at a high enough level to overcome the
threshold bias.

The output of the Fathom Mark Amplifier, 20-cycle rectified
pulses is fed to the plate of V201B and adds to the signal output of this
stage.

All the signals at the output of V201B are coupled through
transformer T201 to the grid of the power stage, V202, a 5881 „ This is
operated as a Class A amplifier, self -bias being supplied by cathode resistor
R208 and bypass capacitor C203.

The signal is co pled to the recording styli through output
transformer T202j current-limiting resistor R209; Jl-Pl, pin J; J2-R2, pin B
and the Trolley Bar on the front of the mechanical Unit, The ground return
of the power stage is made through Power Switch Sl-D in RUN position only.
This is to prevent signal from causing holes to be burned through the re¬
cording paper when the styli are stationary,

Plate voltage for the power stage is +300 volts. Regulated
+150 volts is supplied to the other two stages.

e. Fathom Mark Amplifier

This is a single stage amplifier which raises the level of
the 20 Fathom Mark Generator output and feeds it to the Print Amplifier
circuit.

The 20-cycle pulses are connected from the Mechanical Unit
to the Electronic Unit through Jl-Pl, pin M, and appear across germanium
rectifier GR1, The rectifier action eliminates the portion of the pulse
with negative polarity with respect to ground from passing through the
amplifier.

Variable resistor R211 controls the density of the 20 Fathom
Marks appearing on the record and connects the pulse signals to the grid of
V203B.

V203B, a one-half section of a 6SN?, is connected as a zero-
bias voltage amplifier with plate load R210. The output of V203B is coupled
to the plate of V201B through capacitor C20U* Because of the rectifier
action of CR1, the output of the fathom Mark amplifier will add to the
other signal output appearing at the plate of V201B#

f. Rear Panel

Tiie Rear Panel of the Electronic Unit contains all the
components required for interconnecting the PDR with the Sonar Sounding
Set, with an auxiliary Slow Drum Recorder, the Blower and take-up motors,
the AG Power line, and the ShiD’s ground.

Refer to Figure 22 and read from left to right. See figure 2h

FIG. 22. ELECTRONIC UNIT REAR VIEW

FIG. 23. ELECTRONIC UNIT FRONT VIEW

The two -terminal receptacle labeled INPUT is J3. The UOOO-
cycle signal from the Sonar Sounding Set is connected to Pin B. Pin A is
ground •

The three-terminal receptacle labeled KEYING LEAD is Jl;. The
Keying Lead from the Sonar Set is connected to pin B. Pin A is ground. Pin
C is not used.

The four-terminal receptacle labeled SLOW DRUM is J5 . Pin A
is ground. Pin B is connected to the Gating Switch S12 and provides gated
UOOO-cycle signal voltage. Pin C is connected to the output of V203A through
capacitor C209 and provides 35 volts of precision 1800-cycle frequency.

Pin D is not used.

The cable leaving the center of the Rear Panel is terminated
by two AC line receptacles. These carry line voltage to the Blower and
Take-up motors when the Power Switch, Sl-E is in RUN position.

The three-step selector switch labeled LINE VOLTAGE is S3*

This switch selects the appropriate primary tap on transformer TIOl for
operation at AC line voltages of 105, 115* and 125 volts.

The cable leaving the Rear Panel at the right end of Figure
22 is terminated by an AC line plug. This cable carries 60-cycle AC power
from the Ship’s supply to the PDR.

The lug labeled GROUND is connected to the chassis ground of
the PDR and the Power Supply B-. The Ship’s ground is connected to this lug.

go Front Panel

The PPont Panel of the Electronic Unit contains all the
components required to control and monitor the operation of the PDR.

2iw

Refer to Figure 23 and read from left to right. See Figure

The fuse holder labeled 3 AMP contains the power line fuse FI.
Above it is the neon pilot light indicator. This light goes on when the
Power Switch is in any position except OFF. If the light extinguishes
during normal operation, a blown fuse, FI, or a power line failure is
indicated.

The fuse holder labeled l/k AMP contains the Power Supply
fuse, F2. Above it is a neon indicator light which is connected in parallel
with F2. If this light goes on, it indicates that F2 is blown.

The four-position selector switch with the steps labeled
OFF, START, SYNC, RUN is the Power Switch, SI. This switch is a 6-pole
li -position shorting-type. It controls the application of AC line power to
the Power Supply and the Start, Run, Blower and Take-up motors. It also
completes the circuits of the Sync Motor Amplifier, the Print Amplifier and
the Keying Leads.

The TIME INDICATOR neon light is controlled by switch S5 in
the Time Mark Interrupter circuit. When the light is on, 20 F’athom Marks
are being printed on the record. When the light is off, the marks are
interrupted.

The PHASE RELEASE switch below this light is Slw This
switch controls the Phasing Clutch Relay power. In RELEASE position, the
relay is energized and the Time Mark circuit operates normally. In PHASE
position, the relay is de-energized, and the Time Mark circuit ceases to
operate at the end of the next interruption period. Operation of this switch
enables the PDR time marks to be synchronized with the Ship's Time Standard.

The DEPTH SELECTOR switch is S2, a 2-pole 3-position type.

It is used to select the programmed gating cycle appropriate to the depth
of water over which the Ship is operating. The 3 depth ranges are 0-1500,
1500-3000, and 3000-6000 FATHOMS.

The PING LENGTH switch, S6, selects one of two possible
durations of the transmitted Sonar pulses. The LONG pulse is 20-30 milli¬
seconds in duration. The SHORT pulse is 3-5 milliseconds long.

The EVENT MARKER is a push-button switch, S6, which connects
1800-cycle voltage to the Print Amplifier and causes a black line to be
printed across the width of the record. These lines, in conjunction with
the time-break marks, indicate the time of occurrence of events of interest
in the sounding operation.

The PHONES jack, J6, is available as an audio monitoring point
for the signal coming into the PDR from the Sonar Set.

The GAIN control varies potentiometer R201 and controls the
density of recording of the Sonar signal.

h. Test Points

Refer to Figures 20 and 2U. Eight pin jacks are provided at
the top center of the Electronics Unit for checking the AC line voltage, the
SYNC Motor Amplifier circuit and the Power Supply.

SECTION THREE

I. UNPACKING

INSTALLATION

The equipment, including equipment spares, is packed in two cases. The
large case, weighing approximately 136 pounds, contains the cabinet and
electrical chassis. The small case, weighing 6? pounds, contains the mechanical
unit. Both cases should be kept in the upright position; i.e., with the solid
wooden skid on the bottom. The paper supply is packed in a cardboard carton.

Take care when unpacking or handling the equipment. It may be damaged
when not protected by the packing case. When unpacking, be careful to avoid
damaging the packaging materials more than absolutely necessary. Store the
inside packaging materials in the shipping container for future use.

‘'■lien uncrating the equipment, use the following procedure:

(1) Cut the steel straps with a suitable cutting device or twist with
pliers until the straps tstallize and break.

(2) Turn the cases on end and remove the four screws fastening the
sides to the wooden straps on the skid.

(3) Place the cases right side up and remove the screws that fasten
the sides to the skid.

(h) Carefully lift off the top and sides of the cases.

NOTE: The top should not be disassembled from the sides of the case.

(5) Inspect the contents of the large case, noting that:

(a) The spare stylus band assembly is not damaged. Check the
stylus leaf springs and pressure springs for breaks. Check
that the band has not been crimped.

(b) The electrical chassis is not damaged. Check for broken tubes,
control knobs, etc.

(6) Inspect the contents of the small case, containing the mechanical
unit, noting that the stylus band assembly is not damaged.

(7) To remove the cabinet from its skid, unscrew the nuts from the
bolts located near the corners of the cabinet. Lift up the skid, and push
the bolts out of the wooden clamps. Slide the clamps out of the hand grips.

(8) Lift the cabinet off the skid.

(9) To free the mechanical unit, remove the nuts from the four*
mounting bolts and lift mechanical unit off the skid.

(10) If space is available, store the cases for future use#

II. SELECTION OF SITE

The following factors should be considered when selecting the permanent
site for the Precision Depth Recorder.

A. WEIGHT

Be sure that the platform or table is capable of supporting the weight
of the equipment, lUO pounds.

B. SPACE

Enough clearances should be provided to assure ease in operation and
maintenance. The cabinet dimensions are 29 l/h inches long, 17 inches high,
and 21 3/U inches wide. At least five inches clearance must be allowed
between the rear of the cabinet and the nearest bulkhead. At least 20
inches overhead clearance must be allowed for the top cabinet door to open.

C. VENTILATION

Proper ventilation must be available otherwise the carbon particles
and fumes generated by the recording process may cause the operator serious
discomfort.

D. POSITION

The recorder should be placed in position close to the Sonar Sounding
Set to which it is connected.

III. INSTALLATION

After unpacking, the PDR should be assembled and installed as follows:

(1) hove the recorder cabinet over to the installation site selected
after considering the requirements mentioned in II above.

(2) Secure the cabinet by bolting through the mounting platform into
the threaded holes of the four shock mounts.

(3) Lift up tiie cabinet cover.

CU) Remove the four screws projecting from the brackets on either

side of the electrical chassis. These screws mount the mechanical
unit.

(5) With the wheels facing toward the front of the cabinet, carefully
set the mechanical unit upon the brackets.

(6) Line up the holes in the base casting with the threaded holes in
the brackets. Insert the screws for preliminary line-up,*

(?) Carefully close the cabinet cover. Check to see that the chrome

platen lines up with the cutout in the cover. The platen should be
flush T/ith or slightly above the outside surface of the cabinet
cover. There should be no interference between the cover and. the
paper advance wheel. If necessary, adjust the position of the
mechanical unit so that the conditions stated are satisfied before
tightening the four mounting screws.

(8) Turn the Power Switch to OFF position.

(9) Connect the Mechanical and Electrical Units by engaging Pl-Jl.

(10) Connect the exhaust hose from the exhaust motor to the Mechanical
Unit exhaust connection by twisting the hose into the nozzle until
secure.

(11) Connect the power cable into a 60-cycle 100-130 volt, single-phase
line. The PDF. power consumption is 215 watts. If the line voltage
is known, adjust the line voltage switch, S3, on the Rear Panel to
the corresponding tap.

(12) Two cables must be prepared for connection to the Sonar Sounding
Set AN/UQN-1B.

The Signal Cable is a shielded lead terminated by plug P3 at one
end and by a standard phone plug at the other end, P3 is plugged
into J3 on the Rear Panel and the phone plug is plugged into the
EARPHONES jack on the Sonar Set.

The Keying Cable is a shielded lead terminated by plug PU at one
end 7 and connected internally to the Keying Lead in the Sonar Set.
The Keying Lead must be disconnected from the Sonar Set keying
circuit.

P3 and P)| are supplied with the FDR equipment.

(13) Several changes are required in the Sonar Sounding Set wiring.

These are described in SECTION TWO , paragraph II-A,

When these circuit changes and cabling connections are made, the
installation of the Precision Depth Recorder is complete.

SjiCTa.UK i QUA
v.) PliP AT l U N

.KTROUUCT

The operator must keep in mind that the Precision Depth Recorder
replaces the Recorder Unit of the Sonar Sounding Set. A transmitter ,
and transducer in good working order are required.

only

receiver.

In the instructions which follow, it is assumed that the installation of
the PDR has been made properly according to the directions in SECT UR THREE.
Furthermore, it is assumed that all the operating: controls of the Sonar Set
which are normally used for recording have been properly manipulated.

Refer to Figure R-1 in Reference C showing the Sonar Set operating

controls :

(1) The Power Switch should be OH.

(2) The Range Switch should be in a RECORDER position,
600 Fathoms, or 6000 Fathoms.

(3) The Ping Switch should be on AUTOMATIC.

II. OPERATING PROCEDURES

A. STARTING THE EQUIPMENT

The PDR is started by means of the Power Switch on the Front Panel.

(1) Switch to Start — Wait 30 seconds.

(2) Switch to Sync — Wait for motor to fall into Sync Speed. This is
distinguished by the Steady High-Pitched Tone.

(3) Switch to Run.

B. SETTING THE GAIN

The signal gain is controlled at two daces: on the front nanel of the
Sounding Set and on the front panel of the PDR. The principles to follow in
setting the overall gain are as follows :

(1) The overall gain sbouldbe as low as is consistent with obtaining a
clear record.

(2) The Sonar Set Gain control should always be set as low as possible.

If overall gain is to be lowered, use this gain control.

(3) The PDR gain control should be operated only after the Sonar Set
gain control has been set at the lowest' possible value consistent
with obtaining a clear record. Use this control to raise the overall
gain.

C. DEPTH SELECTOR

This switch should be left in the 0-1500 FATHOM position at all times
unless the noise interference is too great in water deeper than 1500 Fathoms.
Under noisy conditions, switch to the position appropriate to the operating
depth range.

D. PING LENGTH

This switch should be left in the SHORT position at all times unless
•.he noise interference is too great. Under noisy conditions, switch to
,QNG position.

E. EVENT MARKER

This button-switch should be depressed for at least one second duration
to produce a black marker line across the record sheet. These marker lines,
in conjunction with the record time break marks, serve to log in the time of
occurrence of events of interest in the sounding operation. For example,
events which are usually logged in on the echo sounding record in this
manner are changes in Ship’s speed or course. The Event Marker may also be
used to identify the 3 -minute mark on the record which corresponds to an
integral hour or half-hour.

F. TIME MARK PHASING

In order to synchronize the time breaks on the record with the Ship's
time standard (chronometer or WWV), use the following procedure:

(1) Place the Time Phase Switch on the front panel in PHASE.

(2) Wait until at least 15 seconds after the Time Indicator Light
has gone out before doing anything else. (The total waiting
period may be anywhere from 15 seconds to 3 minutes).

(3) Observe the Ship*s time standard either visually, aurally, or
by proxy, and wait until it reaches a time which is an exact
multiple of 3 minutes.

(U) Snap the switch to RELEASE as closely as possible in phase
with the time standard.

(5) The end of the 20 Fathom Mark interruptions is the time break.
The beginning of the 20 Fathom Mark printing is the time break.

(6) The time breaks will remain synchronized, once set, as long as
the PDR is in RUN operation. Whenever the Power Switch is
turned back from RUN position, when loading a new paper roll,
for example, the time marks must be rephased.

G. BASE LINE DETERMINATION

The operator must determine the value of the base line. This line.

made by the recording of the transmitted pings, represents some multiple of
UOO fathoms of depth. The operator must maintain a record of the base line
value on the chart itself or in a separate log. Several methods are suggested:

(1) Correlate the Ship's position with the charted hydrographic in¬
formation,

(2) Start from a known base line (as in port) and mark the record
each time it goes off scale,

(3) Listen with earphones at the monitor jack and count seconds between
the transmission and reception of the last ping of a group (Gated
Operation), In HDR operation (0-15>00 Fathoms), the Ping Switch on
the Sonar Set may be used to stop keying until the last ping has
been timed.

(h) Switch back, for a short time, to normal operation on the 6000 fathom
scale of the Sonar Sounding Set, This method requires that the
switching arrangements be available.

SECTION FIVE

OPERATOR ' S MAINTENANCE

I. INTRODUCTION

The operator should be sufficiently familiar with the details of the
Precision Depth Recorder to service minor defects without technical assistancce.

II, MAINTSNAICE PROCEDURES

A. LOADING PAPER ROLL

The paper is loaded with the recording system stopped. Turn the power
switch back to SYNC to stop and to RUN when ready to start recording again,

(1) Lift Hood Cover and remove old core.

(2) Trim paper edge with a diagonal cut. Hold paper with top
unrolling toward front of recorder.

(3) Load new roll by centering core on left-hand cone and pushing
to left until right-hand cone engages into core hole.

(U) Remove any stylus needle that may be contacting the drum.

(SEE INSTRUCTIONS FOR CHANGING STYLUS.) Par. II-C below.

(5) Set paper load lever in LOAD position and place leading edge
of paper in chute between drum and rear rollers.

(6) Revolve PAPER ADVANCE wheel until paper exits out past lucite
paper cutter.

(7) Lower paper load lever to neutral position (where front rollers
are just off drum) and pull on end of paper to remove any
wrinkles or creases that may have formed.

NOTE : Check that left-hand paper edge is safely behind right
hand edge of stylus deflector. If not, styli may be damaged
and paper torn.

(8) Lower paper load lever to RUN position.

(9) Reinsert styli.

(10) Restore all covers and advance paper a few inches beyond
the chrome platen.

B. LOADING TAKE-UP REEL

(1) Load the paper through the machine per instructions. If

leading edge of paper is not square, tear it square now by
pulling it smoothly over lucite cutter.

(2) Load empty paper core onto place on take-up Reel by pushing
core onto left spring-loaded cone and snapping paper core
into place on right cone*

(3) Pull paper gently up to and under core; bring free end around

core and firmly tuck into place. Roll core a few times to
clinch paper in place.

(h) Revolve knob on left side of Take-Up Reel for manual advance.

0. CHANGING STYLUS

(1) Switch to SYNC.

(2) Revolve wheels clockwise until stylus holder is at nine o’clock
on the left wheel.

(3) Lift spring wire carefully out of slot and remove stylus with
a rotating movement.

(Li.) Install new stylus with a rotating movement.

NOTE: Flattened end of stylus must be away from wheel center.

(5) Carefully replace spring wire into slot.

D. KEYING CONTACTS

The Keying Contacts should be inspected at least once per week.

If carbon particles or other foreign matter has accumulated on the contact
shoe block, (see Figure 17), wipe it with a clean, dry cloth. Ee careful
not to bend the leaf springs.

It is convenient to inspect the Keying Contacts when the paper
roll is being renewed each week as the recording system is stopped and the
hood cover raised for the paper loading operation. '

III. ROUTINE CHECK LIST

As an aid in obtaining reliable and uninterrupted performance, the
following items should be routinely checked at each change of watch:

(i) Log Information. This includes the Base Line Reference,
identification of the Time marks, and details of the Ship’s
maneuvers •

(2) Paper Supply. The amount of paper left on the roll may be

checked by reference to the footage guide mounted next to the
right hand paper support cone. (See Figure 3)*

A roll contains 330 feet of chart paper which lasts about one
week when expended at the rate of 2 ft. /hr. Replace the roll when six
feet or less of chart is left on the roll. Notice of the approach of the
end of the roll is printed on the chart paper. The paper supply in
stock should also be checked.

(3) Stylus Needle. If the needle length is less than l/32

inches, or the record is spotty, replace the stylus needle.

A stylus needle ordinarily lasts at least 200 hours in
continuous operation. The stylus stock supply should be
checked.

00 Gain Setting. See that the lowest gain setting consistent
with a clear record is being used. If the gain requires
lowering, use the Sonar Set control. If the gain requires
raising, use the PDR control.

SECTION SIX

TROUBLE SHOOTING, ADJUSTMENTS AND REPAIR

I. GENERAL

No matter how well equipment is designed and manufactured, faults will
always occur under service conditions. When such faults occur, repairmen
must be able to locate and correct them as rapidly as possible.

However, it should be borne in mind that not all cases of trouble
are caused by a defect in the equipment. The operator may fail to perform a
required function at the proper time and report a case of trouble not
realizing the true nature of the difficulty. Erratic operation of the FDR
also may be caused by interference from other equipment. The following
paragraphs describe the more common remedies and adjustments required by
the FDR equipment. For details of other adjustments, e.g. replacing sync
motor, consult Reference D.

II. TROUBLE SHOOTING BY THE OFERATOR

Before calling in a serviceman, the operator should make the following
checks :

A. FAILURE TO START

If the Start Motor does not turn in START position, check the pilot
lamp above the 3 ampere fuse on the front panel. If the light is out, either
the fuse is blown, the AC line plug is disconnected, or the Ship’s AC supply
has failed.

B. FAILURE TO SYNC

If the Sync Motor attempts to, but does not fall into synchronism in
SYNC position, turn back to START, wait 30 seconds and try again. If several
attempts fail, call in the serviceman.

Co PAFER FEED FAILURE

If the chart paper does not feed properly, make sure that all in¬
structions for loading paper (Section FIVE, Par0 II-A) have been followed.
Especially check to see that Paper Load Lever is in RUN position.

If necessary, remove roll, and load over, carefully following loading
instructions •

D. STYLI NOT PRINTING

If the ping signals are not printing on the record, check the condition
of the styli first and then make sure that all the operating instructions in
SECTION FOUR have been followed.

Especially check to see that all the Sonar Set controls are in correct
position. (See Section Four, Par. I).

E. CONTINUOUS PING

If the transmitter appears to be keying continuously, SHUT DOWN THE
SONAR SET LI .ED LATELY OR SERIOUS DAMAGE MAY RESULT.

HI. TROUBLE SHOOTING PROCEDURES

A. GENERAL

(1) In case of trouble, the first step in the correction procedure
is the isolation of the trouble between the PDR and the Sonar
Sounding Set.

(2) If the trouble is in the Sonar Set, follow the trouble-shooting
procedures in Reference C.

(3) If the trouble is in the PDR, the first step in the correction
procedure is the isolation of the trouble between the Mechanical
Unit and the Electronic Unit.

(U) Mechanical difficulties must be corrected before electrical
adjustments are made.

B. ISOLATION PROCEDURE

In case of loss of signal, disconnect the keying lead plug, JU, at the
rear of the PDR. Connect the crystal earphones supplied with the Sonar
Sounding Set AN/UQN-1B to the Earphone jack, J6. The Sonar Set may now be
checked for proper operation by momentarily shorting pins A and B in JU,
which should key the Sonar Transmitter, and monitoring the output with the
earphones •

NOTE: BE CARER UL NOT TO ALLOW MORE THAN A MOMENTARY SHORT BETWEEN PINS
A AND B. CONTINUOUS KEYING OF THE SONAR TRANSMITTER WILL CAUSE SERIOUS DAMAGE.

If the Sonar Set is keying and receiving properly, trouble is indicated
in the PDR. The more common failures are listed below.

Use the test turret socket for measuring tube socket voltages without
removing the Mechanical Unit. Use the test cable for interconnecting the
Mechanical and Electronic. Units if the Mechanical Unit is removed. The
Socket and Test Cable are included in the Spare Parts.

C. TROUBLE CHART

Trouble Probable Cause Remedy

1. Start motor does not
turn in START position*

A. AC plug out or no

AC power.

Bo Power Fuse Blown

A* Plug in AC power

B. Turn power off and
replace fuse.

20 Sync Motor tone

not heard*

A* No reading at

A. B+ Fuse Blown*

A* Turn Power OFF and replace

B+ test points

Defective V101.

fuse. Replace V101.

B. No reading at

B. Defective V20h,

B. Replace V20l*, V205

SYNC BIAS test points

V205.

C* No reading at

Co Fork Amplifier

C. Check V301, V302

pin 1, V203A

Defective

D* No reading at

D. Defective V203

D. Replace V203

pin 2, V203A

3* Sync Plotor Tone

Heard but does not
fall into Sync

A. Sync drive volts
reading low at pin 2,
V203A

Bo Sync drive read¬
ing normal, sync volts
reading low at test
points .

A. Sync Drive too low.

B. Defective V20U or
V205

A* Adjust SYNC DRIVE,
potentiometer, R213.

B. Replace defective tubes.

U. Sync Motor drops out

A. Sync Drive too low

A* Adjust SYNC DRIVE.

of synchronism when

potentiometer, R213.

band starts moving.

B. Defective V20li or

B. Replace defective tubes*

V205

5* Band does not move

A. Defective V103

A. Replace V103

in RUN position.

6* Styli do not print* A. Stylus not touching B* Replace stylus

paper*

B. Print Amplifier B. Check V201, V202.

Defective

Trouble

Probable Cause

Remedy

7. Jitter in 20

Fathom Marks

A. Bent Stylus Needles

Bo Stylus Holders out
of index

A. Replace Stylus

B. Reset index with
fixture.

8. 20 Fathom Marks
net printing

A. Defective V203B

A. Replace V203

9. Time Break Phasing
Does not phase

A. Defective C101A
power supply

A. Replace C101A

10. Ragged or No

Keying

A. Defective or dirty
Keying Contacts

A. Clean or replace
keying contacts

IV. PREVENTIVE ROUTINE

MAINTENANCE, LUBRICATION

A. PREVENTIVE MAINTENANCE

What to Check

How to Check

Precautions and Remedies

1. Gear System

Remove covers. Inspect Clean out dirt with nylon-
for dirt or damage. bristle brush or equivalent.

Replace damaged parts and
lubricate if necessary.

2. Exhaust System Remove nozzle, inspect Clean the nozzle. Replace

hose for cracks. Check hose if necessary. Lubricate
blower motor lubrication, blower motor when required.

3 o Brushes

Examine Brushes and Clean carbon from brushes

Wheels and wheels.

ht Machine Base
5. Paper feed system

6. Keying Contacts

Inspect for foreign Clean out foreign matter,

matter.

Check operation of paper
feed mechanism and rol¬
ler ass’ys. Check paper
guide finger for damage.

Clean rollers and lubricate
roller shaft bearings if
necessary. Replace damaged
guide finger strip if necessary.

Check for accumulation
of foreign matter and
contact wear.

Clean contact shoe block
once per week with clean,
dry rag. Replace contacts
if necessary.

B. LUBRICATION

The two types of bearings used on the PDR are ball bearings and
"oilite" or oil impregnated bronze sleeve bearings.

The ball bearings do not need any cleaning or lubrication. Short of
a rare need for replacement, these bearings should not be disturbed.

The "oilite" bearings do need some periodic lubrication. Despite the
natural oil retention ability of these bearings, they will eventually run
dry due to seepage and evaporation. To assure good operation of the machine,
it is necessary to lightly lubricate all points employing these bearings at
least twice a year. To do this it is only necessary to use one or two drops
of a suitably light lubricating oil at each bearing point. These points are:

(1) Two oil tubes on the blower motor.

(2) The sleeve bearings at either end of the drum shaft.

(3) The sleeve bearings in the paper roll support cone bracket.

(U) Oil cup hole on synchronous clutch ring.

(5) Either end of front pressure roller shaft bearing.

All gears should be lubricated at least twice a year with a medium
grease similar to Lubriko M6 or equivalent. Apply a thin film using a
nylon-bristled brush or similar lint-free applicator.

NOTE: KEEP AWAY ALL GREASE AND OIL FROM THE BAND ASSEMBLY, TROLLEY BAR

AND OTHER PARTS ON THE FRONT OF THE MECHANICAL UNIT.

V. MECHANICAL ADJUSTMENTS AND REPAIR

A. STYLUS HOLDER ASSEMBLY, ADJUSTMENT AND REPLACEMENT

Normally, the stylus holder assembly should require adjustment only
when replacing a broken or damaged stylus leaf spring.' A special tool is
required for adjustment. This tool is not to be used as a check for proper
alignment of a stylus holder assembly.

Before an attempt is made to adjust an undamaged stylus holder assembly,
it should be determined if the holder assembly is definitely out of index
(alignment). This is done by using styli in all assemblies that are known
to be straight. With straight styli, an improperly indexed holder will produce
20 Fathom Marks with every third dot displaced. This displacement will be
regular — that is, appear the full width of the chart and every third line.

If the pattern is irregular, faults other than the misalignment of a stylus
holder are indicated.

(1) Equipment Required

lo Stylus holder mounting fixture assembly.

2. Small screw driver

3 e Replacement parts if required

(2) Procedure

1. Turn power switch to START. Lift the hood.

2. Remove styli from all holders.

3* Manually rotate the left wheel clockwise until stylus
assembly #1 is at 9 o'clock on the left wheel rim.

(Stylus holders are identified by blue markings on the
band) .

ho If the sync arm is close to the stylus assembly, hold the
left wheel firialy and rotate the sync arm clockwise
approximately l/h turn or until perpendicular.

5® Refer to Figure 25 o Loosen retaining screw and remove
alignment pin from protective storage. Loosen the clamp
screw until the threaded end no longer protrudes into the
slot.

6c Mount fixture on the left wheel as illustrated in Figure 25®

7 o Position fixture so that Positioning Pin #1, Figure 25*
is in contact with the nylon block. Positioning Pin
#2 is pressed on wheel rim® While maintaining these two
contact points, press the fixture radially on the wheel
rim and firmly tighten the clamp screw.

8. Loosen the stylus block screws approximately one turn.

9. Insert the alignment pin through the stylus bushing and
through the fixture bushing. Insert the pin all the way
through and apply sufficient pressure so that the alignment
pin shoulder, stylus bushing and fixture bushing are in
firm contact.

Apply the pressure firmly along the length of the pin so
as not to cock the pin or the stylus bushing. While
maintaining the pressure, tighten the stylus block screws
using a small screw driver.

CAUTION: Tighten the screws carefully. Do not strip the
threads in the nylon block.

10. Remove the alignment pin from the fixture. The pin should
slide out smoothly.

11. Loosen the clamp screw and remove the fixture from the
wheel rim.

12. Insert a stylus in the stylus bushing.

13. Align the remainder of the stylus assemblies in sequence
by repeating steps 3 through 12.

Hi. After alignment of all stylus assemblies, the alignment
pin should be returned to protective hole in fixture and
locked with retaining screw.

B. ADJUSTMENT OF STYLUS PRESS SPRING (15-2-026)

Improper handling of this long wire spring may deform it so that it
will not push the stylus all the way in. Adjustment may be made without any
tools •

1. Lift hood of recorder.

2. Switch to START and SYNC.

3. Bring suspected stylus assembly to either the left or fight hand
side of the machine by revolving the wheels.

It. Remove stylus and bend wire spring towards the bushing and beyond
the face of the bushing so that when released it will assume its
proper position — i.e. near the rear face of the bushing. At
this setting there will be approximately 5 to 10 grams of force on
the needle.

C. REPLACING STYLUS BUSHING (15-2-019)

When replacing the stylus bushings do not use forces great enough to
move or damage the stylus leaf spring. Bushings will require replacement
only when worn flat or damaged. The stylus bushings are hard chrome plated.
The inner hole contains a jewel bearing in each end. To replace a stylus
bushing proceed as follows :

1. Remove old stylus bushing by inserting the point of a pick (or
small screw driver) in the "V” section beneath the bushing.

2. Slight pressure will cause the bushing to pop out. Do not use
enough force to move or damage the stylus leaf spring. Hold the
stylus leaf spring while doing this to prevent damage to the leaf.

3. Rotate the bushing to position the flat side where it does not
contact the trolley bar. (approximately 120° is recommended).

U. Place the bushing on the leaf spring and position it so the groove
around the middle is centered on the leaf spring.

5* Press firmly. The bushing will snap into position. Check that the
center guide spring has fallen into the groove on the bushing.

Do CHANGING THE STYLUS BAND (15-2-031)

(1) Removing Stylus Band

lo Set Control in SYNC position.

2o Remove all styli from band. (See "changing Stylus”)*

3. Holding lower section of band with both hands, gradually
pull band outward and off the left hand wheel while
rotating the band clockwise.

(2) Installing New Band

1. Set control in SYNC position.

2. Slip new band completely around left hand wheel.

NOTE: Locate band so that end with hole of sync arm
is in front of an empty lug.

3* Carefully lay top section of band onto left wheel. While
rotating right wheel, gently push flat section of band
completely onto it.

CAUTION; Check that band is fully engaged onto wire guides
on the wheel rims.

E. REMOVAL OF MECHANICAL UNIT

1* Turn selector switch to OFF position.

2. Disconnect the cable from the Electronic Unit..*

3. Disconnect the exhaust hose from the suction adapter.

ho Remove the two mounting screws at each side of the base
casting and remove the Mechanical Unit.

NOTE; If stylus band is left on unit, handle Mechanical
Unit with care to avoid damage to the band.

F. REPLACING KEYING CONTACTS

If the leaf -spring rotating keying contacts become bent or broken, they
should be replaced as follows;

(1) With power switch in OFF position^ rotate keying block assembly
COUNTER-CLOCKWISE until a convenient position is reached for removal
of the leaf -spring retaining screws.

(2) Remove defective leaf springs.

(3) Assemble new leaf springs, but do not tighten retaining screws down
hard.

(U) Rotate keying block assembly CCW and check that leaf springs contact
shoe block over area of contact shown in Figure 17 • Adjust area
of contact by loosening retaining screws and sliding leaf springs
along keying blocks*

CAUTION: DO NOT DEFORM LEAF SPRINGS.

(5) Tighten retaining screws.

VI. ELECTRICAL ADJUSTMENTS AND MEASUREMENTS

A. SYNC DRIVE

This control is a potentiometer, R213, located on top of the Electronics
Unit near the right side. (See Figure 20). R213 controls the gain of the

Sync Motor Amplifier.

It should be adjusted so that each phase potential of the Sync motor is
between 200 and 250 volts. The phase voltages may be read at the test points
provided on top of the Electronics Unit.

B. 20 FATHOM MARK DENSITY

This control is a potentiometer, R211, located on top of the Electronics
Unit near the right side. (See figure 20). R211 controls the gain of the

Fathom Mark Amplifier, V203B.

It should be adjusted so that the printed 20 Fathom Mark lines are
just dense enough to be read comfortably.

Co LINE VOLTAGE

This control is a single-pole, three-position selector switch, S3,
mounted at the rear of the Electronics Unit. (See Figure 22). Switch S3
selects one of three taps on the primary winding of power transformer, T101,
in order to adjust the output of T101 for line voltages of 105, 115* and
125 volts.

The selector switch should be placed in the position corresponding
to the actual AC line voltage. The AC line voltage may be read at the test
points on top of the Electronic Unit. (See Figure 20.)

SOCKET VOLTAGE MEASUREMENTS

Test Condi t i ons :

Unless otherwise specified all DC voltages are taken on
20,000 OHMS PER volt meter from tube or capacitor pin
to chassis ground with test adapter socket.

AC voltages measured on 1,000 OHMS per volt meter.
Selector switch in RUN position.

All readings are in volts.

TUBE

PIN NUMBERS

Ref . Des .

Type

VI 01

5r4

325dc

420ac

325dc

VI 02

0A2

1 50dc

—

VI 03

2H20

(a)

. 60 a c

V201

6SN7

70dc

2 . 5dc

1 50dc

1 2dc

6, 3ac

V202

5881

6.3ac

290dc

26dc

V203

6SN7

290dc

1 Odc

27dc

6. 3a c

V204

6SN7

-1 DC

290dc

8dc

-1 DC

290dc

8dc

6. 3ac

V205

6SN7

-1 DC

290dc

8dc

-1 DC

290dc

8dc

6. 3ac

V301

6SN7

50dc

1 . 8dc

85dc

7 . 5dc

6. 3ac

V302

6AG7

6. 3ac

-1 DC

1 7dc

70dc

Cl 01

(3x15
mfd )

290dc

320dc

20dc

Notes :

(a) Measured from pin 2 of V103.

NC No CONNECT I ON .

SIGNAL VOLTAGE MEASUREMENTS

Test Cond i t i ons :

Selector switch in RUN position.

Gain control at maximum.

.5 VOLT 4 KC SIGNAL FROM AUDIO OSCILLATOR FED TO INPUT JACK.
Measurements made with AC VTVM from socket pin to chassis ground.

TUBE PIN NUMBERS

Ref . Des .

Type

V201

6SN7

. 5ac

Uac

—

Uac

2 . 5ac

—

V202

5881

—

1 00a c

—

Uac

—

V203

6SN7

5ac

25ac

—

X)25ac

2 . 5ac

—

V204

6SN7

1 5ac

250ac

—

1 5ac

250ac

—

V205

6SN7

1 5ac

250ac

—

1 5ac

250ac

—

E. SOCKET RESISTANCE MEASUREMENTS

Test Conditions:

Power plug out of AC socket.

Selector switch in RUN position.

Unless otherwise specified all measurements are made from

TUBE OR CAPACITOR PIN TO CHASSIS GROUND WITH TEST
ADAPTER SOCKET.

All readings are in ohms (K = 1,000).

Ref . Des .

T YPE

PIN Nl
3 ! 4

JMBERS

VI 01

5R4

12K

VI 02

0A2

1 0K

—

VI 03

2H20

(a)

V201

6SN7

1 IK

(s)

47K

1 .5K

1 00K

(b)

250

1 .5K

V202

5881

, - .--I

(c)

12K

1 . 3K

500

V203

6SN7

(d)

1 00K

(c)

750

(o)

1 .2K

-P>-

-J CD
7*7'—

V204

6SN7

500

(c)

100

150

500

(c)

100

150

V205

6SN7

500

(c)

100

150

500

(c)

100

150

V301

6SN7

1 .4k

(b)

11 OK

2.2K

1 50K

(b)

50K

(d)

1 0K

V302

6AG7

1 00K

2.2K

(b)

280K

(b)

11 OK

Cl 01

(3x15

MFD )

12K

1 . 7K

Notes :

(a) Measured from pin 2 of V103.

(b) Measured from RB+ test point.

(d) Varies with setting op potentiometer.

SECTION SEVEN

SPARE PARTS LIST

SPARES

TFC PART NO.

ITEM

PER

SET TFC PART NO.

ITEM

SPARES

PER SET

15-2-031

Band Assembly

005/Vl|001)43

NE51 Neon Lamp

19-20-001

Stylus

1U-56-618

Power Transformer

15-2-019

Bushing

1U-56-61?

Filter Reactor

15-2-523

Leaf Spring

61-11-02-00

Stylus Transformer

I 1

Assembly

UlB-11-00-00

Driver Transformer

15-2-026

Stylus Spring

UlB-ll-03-00

Driver Transformer

lU -56-03 2

Keying Contact

1*1-00-00-27

3 x 15 MFD Capacitor

llt-56-03lt

Contact Block

12-05-01-91

Pick Up Coil

1U-56-616

Micro Switch

1*1-00-00-31

Truarc Pliers #0018

lii-56-617

Micro Switch

Actuator

1*1 -00-00-32

Truarc Pliers #2

005/V000107

6SN7 Tube

Hex Wrench Kit

005/vli00112

6AG7 Tube

1*2-00-00-1*2

Truarc, 3/16"

005/vU001Ii9

5RU Tube

1*2-00-00-1*3

Truarc, l/l*"

005/vI|00l67

5881 Tube

1*2-00-09-01*

Truarc, 5/16"

005M00132

0A2 Tube

1*2 -00-09-05

Truarc, 3/8"

005/V100109

2H20 Tube

62-00-00-33

Truarc, 1/2"

1U-56-621

1/h Amp Fuse 3 AG

15-2-132

Truarc, 5/8"

1U-56-622

3 Amp Fuse I4AG

lU— 56— 62U

Test Cable

Slo-Blo

Instruction Manual

FDR MK V 1

Test Turret Socket 1

Stylus Holder Ad¬
justment fixture ]

Instruction manual
RJ-2 Recorder 1

Q !
0
<D|

FIXTURE

BUSHING

FIG’. 25

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